Rotary tool



Jan. 7, 1941.v

D. BRUZON ROTARY ToL Filed Nov. 3, 1938.

i annif wim/Q7 Patented Jan. 7, 1941 UNITED STATES ROTARY TOOL DavidBruzon, Chicago, lll., assignor to Perfection Auto Parts Mfg. Co., tionof Illinois Chicago, Ill., a corpora- Application November 3, 1938,Serial No. 238,547

3 Claims.

This invention relates to improvements in screw driver bits and wrenchsockets and more particularly to such as are used with power drivenmeans.

An object of this invention is the provision of a screw driver bit andwrench socket in which the torque of the operating means is applied to ascrew or nut to drive same and is released when the operation iscompleted.

Another object of this invention is the provision of a screw driver -bitand wrench socket which completely eliminates the possibility ofshearing off of the head from the body of the screw. A

A further object of this inventionvis the provision of a 4screw driver'bit and 'wrench socket which is adapted for securement to any powerdriven spindle.

A still further object of this invention is the 2'0 provision of a screwdriver bit and wrench socket which operates with equal eiciency ineither direction of rotation to drive or to remove nuts, bolts andscrews.

A still further object of this invention is the 25 provision of a screwdriver bit and wrench socket which is extremely simple and durable inconstruction, which has very few parts and which can `be manufactured atlow cost.

With the foregoing and other objects in view, 30 the invention consistsof the novel construction,

combination and arrangement of parts, as hereinafter more specificallydescribed and illustrated in the accompanying drawing, wherein is showna device in accordance with this invention, but 35 it is to beunderstood that changes, variations and modifications can bev resortedto which fall within the scope of the appended claims.

In the drawing wherein like reference characters denote correspondingparts through the sev- 40 eral views:

Fig. 1 is an elevational viewof the screw driver bit. v. f

Fig. 2 is a vertical sectional view taken on line 2-2 of Fig. 1.

Fig. 3 is an enlarged plan view of a clutch member.

Fig. 4 is an enlarged4 elevational view of the clutch lmembers inoperative engagement.

In' the drawing wherein is shown a preferred 5o embodiment of myinvention the numeral I0 designatesthe screw driver assembly which isadapted to be secured to a driving spindle by means of a chuck I2. Thescrew driver assembly I8 comprises a housing formed of two cylindricalmem- 55 bers, an upper member I4 having an externally threaded portionI5 and a lower member I6 hav- I ing an internally threaded portion I8and apertured as at to receive the driven spindle I1,.l presently to bedescribed. The member I4 is provided with a spindle extension 2|integrally 5' formed therewith which is adapted to be secured in thejaws of the chuck I2. A hole 22 is provided in theupper member I4 forlubricating purposes.

Rigidly secured as by a pin 24 in the upper 10 housing member I4 is aclutch member 25 having an exposed corrugated surface 26 withI alternateribs and recesses, substantially ,triangular in cross section, radiatingfrom the center. Rotatlably and slidably mounted in the housing mem- 15ber I4 is a longitudinally bored driven spindle I'I which is provided,at one end, with a slot 28 and at the other end with an enlarged portion38 having a complementary corrugated surface 82 adapted for engagementwith the clutch mem- 20 ber 25. A coil spring 34 positioned in thehousing member I6 and encircling the spindle I1 bears against bushings36 and 38 and serves to retain the clutch member and 38 in resilientengagement.

It is seen that by advancing or receding the housing members I4 and I6with respect to each other the compression of thespring 34 can beadjusted to increase or decrease the torque to a predetermined point. Aset screw 38 serves to retain the housing members I4 and I6 in` adjustedrelative position.

A screw driver bit 40 is reciprocally mounted in the bore 49 of thedriven spindle Il'and isop- 'eratively connected thereto by a pin 42which extends through the bit 40 and which 'operates 'in 'the slot 28 ofthe driven spindle I'I to cause the bit 40 and spindle II to rotatesimultaneously. -A spring 44 mounted in the core 49 of the drivenspindle I 1, at one end,bears against the enlarged portion of thespindle I1 and at the other end, against a shoulder 4I formed on thescrew driver bit 48 and serves to yieldingly hold the bit 40 inoutermost position. y Y o An inverted cup shaped mem-ber '46 mounted onthe bit 4I) encloses the lowerend of same and serves asa guide or finderfor the'screw. The bit 40 isv provided with a circumferential groove 41in which is seated a spring ring 48 which acts as -a shoulderto securethe member 46 on the bit 4U. A helical spring` 5U encircling the bit 48yieldingly maintains the member 46 at the extreme portion ofthe bit.While ascrew driver bit is illustrated, it will be understood that a 55drive nuts andbolts.

In operation, the clutch faces 26 and 32 are always in engaged relation'and the tool rotates continuously as a unit. When the tool is brought incontact with the work the spring 50 permits the guide member 46 to yieldwhile alignment between the bit 40 and the slot of the screw is beingeilected. When the point of the bit 40 registers in the screw slot,slight pressure compresses the spring 50 and causes the bit to recedewithin the longitudinal bore 49 of the driven spindle I1. It will beseen that the yielding arrangement'of the guide 46 and the bit 40 issuch that the deiacing or marring of the work' is completely avoided.

Assuming that a specified torque is required for a particular job andthat an adjustment for same has been made on the spring 34, it will beseen that during the driving operation the driven spindle i1 rotateswith the driving spindle 2|. However, when the torsional resistance ofthe screw exceeds the applied torque the spring 34 will yield and permit'the clutch surfaces 2B and 32 to slip on each other, the incidentalnoise of said slipping warning the operator that the operation has beencompleted and that the tool should be withdrawn. The slipping of theclutch members 26 and 32 has the eiect of applying tangential blows tothe screw which further serves to tighten same to a greater degree.

When it is desired to use the device for removing screws, nuts and boltsthe rotation of the driving spindle is reversed so that the torque isapplied in a counter clockwise direction. Ii the screw or nut yields tothe applied torque there is no slipping of the clutch membersv upon eachother. However, if it does not yield and offers resistance to therotation of the tool the clutch members will slip upon each other and ineffect lapply tangential blows to the screw or nut the application ofsuch blows tending to eiect a release of the screw or nut. It will thusbe seen that I have provided a tool which is adapted for drivingorzremoving screws, nuts and vbolts .and which is automatically arrestedin its "operation when the torsional resistance exceeds the appliedtorque, the tendency to injure the jtool or to deface the Work therebybeing completely eliminated.

p It is to be understood that the form of my invention, herewith shownand described, is to be taken as a preferred example of the same, andVthat various changes in the shape, size and ar-,y

rangement of parts may be resorted to, without departing from the spiritof my invention, or the scope of the appended claims. u

I claim:

l. A device of the character described compris# ins a4 housing havingavgshajnk at vone end thereof.' adapted for connection'with a drivingspindle, a

toothed clutch member rigidly .secured within the housing at the endadjacent the shank member,L the/other end of said housing comprising awall.v

n 2,227,627 4socket wrench may be substituted therefor to independentlyrotatable and axially movable relative to the other clutch member, aspring within the housing for normally maintaining said clutch membersin operative engagement, a longitudinally bored spindle mounted on saidcomplementary clutch member and projecting through the Wall opening ofthe housing, a tool shank mounted in said spindle for rotation therewithbut being axially movable relative thereto, and a spring within the boreof the spindle abutting against the tool shank for normally urging thetool shank outwardly o f the housing.

2. A device of the character describedtcomprising a housing, a shankmember associated 4with said housing and adapted for connection with adriving spindle, a toothed clutch member thereto, resilient meansmounted within thel longitudinal bore for yieldingly holding said toolshank outwardly of said spindlegjgA and spring means for normallymaintaininfisaid clutch l members in operative engagement, said clutchmembers arranged to be relatively movable when the torsional resistanceon the depending spindle exceeds the applied torque of the drivingspindle,

the relative movement of said clutch members serving to applytangential. blows to said depend- 'c ing spindle.

3. A device ofthe character described comprisl ing a housingformed ofupper andlower sections,

a shankv mounted on the upper section adapted for connection with adriving spindle, a toothed clutch member rigidly secured within thehous`A ing at the end adjacent the shank member, the

lower section of said housing having a wall at its lower end with anopening therethrough, a complementary toothed clutch member mountedwithin the housing,` said complementary clutch member beingindependently rotatable' and axially movable relative to the otherclutch member, a

y spring within the housing abutting against the lcomplementary clutchmember and the lower wall of the lower section for normally maintainingsaid clutch members in. operative engagement, said sections beingmovable-relative to each other to vary thegtension on said spring, a1ongitudi4 'nally boredfspindle mounted on said complementary clutchmember and projectingA through the wall opening of the lower section, atool shank A-mounted in said spindle for rotation therewith but beingaxiallymovable relative thereto, and ajj .spring withinlthe bore of thelspindle abutting against the tdo'ljfshank for` normally urging the.

"tool Vshank outwardly of the housing.

DAviD BRUzoN. v

